If you are a bounty hunter it's necessary for me in my opinion to sell the tokens you are holding to secure your profit from doing the bounty tasks however if you're an investor and you studied the project and you have a trust in that project I think it's worth holding for but I think most of the altcoins are crushing and will recover after a long time.
So if you really want a profit then sell it for a secure profit and if you want a big and nice profit hold a token that you know will pump in the future.
Bounty hunter or investor?? It doesn't matter who are you between the two as long as you get profit then you're good.
Bounty hunters tend to sell their rewards as their tokens will be listed on an exchange and so is the investors. Maybe there are some hunters and investors that will hold a small amount for the future but most of their tokens will be sold on an exchange causing the price of token to decrease.